Here's my review of the Arturia KeyStep 37 controller/sequencer/arpeggiator while plugged into some modular, a MIDI synth and a computer.

http://www.arturia.com
Arturia sent me this keyboard for review.

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Index - 0:00
Intro - 0:20
Playing the keys - 3:15
Chords - 8:00
Arpeggiator - 13:28
Sequencer - 21:53
Conclusions - 31:07